KEY BENEFITS

Increased Skin Youthfulness

Proven to simultaneously smooth the look of fine lines and wrinkles while visibly boosting skin glow and radiance.
Brighter, More Even Complexion

Proven to visibly brighten the skin tone, for a more even and healthy-looking skin appearance.
Lightweight Nourishment

This jojoba (pronounced 'huh-hoh-ba') seed oil-based formula delivers effective yet non-greasy nourishment for visibly softer and comforted skin.

PROVEN RESULTS

7 days to restored skin radiance*
7 days to visibly brighter
smoother skin*
96% of sensitive skins agreed C-Tetra was gentle on the skin*
4 weeks to visibly reduced wrinkles & dark spots*
90% agree skin feels instantly softer*

*Proven via independent consumer study conducted over 4 weeks on 52 participants with sensitive skin.

HOW TO USE

STEP 1

After cleansing in the morning, massage 4 drops across the face, neck and décolletage.

STEP 2

Leave to absorb before applying sunscreen. We recommend Advanced Day Ultimate Protect.

LOVED & RECOMMENDED

Ultra-gentle & perfect for visibly radiant skin

DANIEL ISAACS

Chief Product Officer
I like everything that Medik8 does and this is no exception.

EVE CAMERON

Beauty Director - Red
Gives a wonderful glow & has massively improved my skin's texture.

JOANNE A

Verified Medik8 Customer

KEY INGREDIENTS

3% Stabilised Vitamin C (tetrahexyldecyl ascorbate)

A low-irritation form of vitamin C that delivers exceptional antioxidant protection against harmful free radical damage while brightening and supporting collagen production for a visibly even, more youthful-looking complexion.
Vitamin E

A powerful antioxidant that provides additional antioxidant protection against the ageing effects of free radicals. It also helps to boost the power of retinol for optimum visible results.

THE SCIENCE BEHIND THE FORMULA

It is exceptionally difficult to formulate a vitamin C serum that will retain its power over time. That's because vitamin C is notoriously unstable, meaning its effectiveness can be compromised when it comes into contact with light, heat or air.

That's why we have chosen to formulate C-Tetra with an extremely stable form of vitamin C (tetrahexyldecyl ascorbate), so you can be sure that your vitamin C is still as potent and effective 6 months after you first opened it.

GOOD TO KNOW

NO ARTIFICIAL FRAGRANCE
NO SYNTHETIC COLOURS
PARABEN FREE
CERTIFIED BY THE VEGAN SOCIETY

FAQS

What's the difference between C-Tetra and C-Tetra Luxe?

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C-Tetra is our original, best-selling vitamin C serum. It's the perfect option for those who are new to vitamin C or those with sensitive skin, who still want visible age-defying results. C-Tetra Luxe is our supercharged vitamin C serum - ideal for those looking for clinical brightening and nourishing power. Both serums are formulated with stabilised tetrahexyldecyl ascorbate.
Can I use C-Tetra alongside vitamin A?

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Absolutely. In fact we recommend it as part of our pioneering CSA Philosophy which champions vitamin C plus sunscreen by day, vitamin A by night as the simple secret to glowing, youthful-looking skin.
Can I use C-Tetra if I'm pregnant or breastfeeding?

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As a cosmetics company, we are unable to provide product advice in relation to medical conditions such as pregnancy. We would recommend discussing the ingredients with your GP or midwife before use. As general guidance, this product does not contain any ingredients which we would recommend to avoid during pregnancy, unless advised by your doctor.

C-Tetra®

DERMATOLOGIST RECOMMENDED

CLINICAL RESULTS

AGE-DEFYING EXPERTS

MADE IN THE UK

B CORP CERTIFIED

C-Tetra®

Lipid 7% Vitamin C Radiance Serum Full Details

Sorry, this product is currently out of stock

KEY BENEFITS

Increased Skin Youthfulness

Brighter, More Even Complexion

Lightweight Nourishment

PROVEN RESULTS

HOW TO USE

STEP 1

STEP 2

LOVED & RECOMMENDED

KEY INGREDIENTS

THE SCIENCE BEHIND THE FORMULA

GOOD TO KNOW

FAQS

What's the difference between C-Tetra and C-Tetra Luxe?

Can I use C-Tetra alongside vitamin A?

Can I use C-Tetra if I'm pregnant or breastfeeding?

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